[llvm] [LoopVectorizer] Propagate underlying instruction to the cloned instances of VPPartialReductionRecipes (PR #123638)

[via llvm-commits]

llvmbot wrote:


<!--LLVM PR SUMMARY COMMENT-->
@llvm/pr-subscribers-llvm-transforms

@llvm/pr-subscribers-vectorizers

Author: Nicholas Guy (NickGuy-Arm)

<details>
<summary>Changes</summary>



---
Full diff: https://github.com/llvm/llvm-project/pull/123638.diff


1 Files Affected:

- (modified) llvm/lib/Transforms/Vectorize/VPlan.h (+2-1) 


``````````diff
diff --git a/llvm/lib/Transforms/Vectorize/VPlan.h b/llvm/lib/Transforms/Vectorize/VPlan.h
index 87f87bf1437196..9d8136a0ebf57d 100644
--- a/llvm/lib/Transforms/Vectorize/VPlan.h
+++ b/llvm/lib/Transforms/Vectorize/VPlan.h
@@ -2459,7 +2459,8 @@ class VPPartialReductionRecipe : public VPSingleDefRecipe {
   ~VPPartialReductionRecipe() override = default;
 
   VPPartialReductionRecipe *clone() override {
-    return new VPPartialReductionRecipe(Opcode, getOperand(0), getOperand(1));
+    return new VPPartialReductionRecipe(Opcode, getOperand(0), getOperand(1),
+       getUnderlyingInstr());
   }
 
   VP_CLASSOF_IMPL(VPDef::VPPartialReductionSC)

``````````

</details>


https://github.com/llvm/llvm-project/pull/123638